Adding a Log to a Volume

Adding a Log to a Volume

Dirty Region Loggin (for mirrored Volumes)	RAID-5 Loggind (for RAID-5 volumes)
Log keeps track of changed regions.	Log keeps a copy of data and parity writes
If the system fails, only the changed regions of volumes must be recovered	If the system fails, the log is replaced to speed resynchronization
DRL is not enabled by default. When DRL is enabled, one log is created.	RAID-5 logging is enabled by default
You can create additional logs to mirror log data	RAID-5 logs can be mirrored
	Store logs on disks separate from volume data and parity